Does Core Strength Actually Fix Back Pain?

Ask ten people with back pain what they've been told and most will say they need to strengthen their core. It's not wrong, exactly - but the way 'core strengthening' is typically prescribed is often unhelpful, and sometimes makes things worse.

What the core actually does

The core is not primarily a movement system - it's a stabilisation system. Its job is to create a stable base from which the limbs can move and through which force can be transmitted. When the deep stabilisers (transversus abdominis, multifidus, pelvic floor, diaphragm) are working well, the spine is protected under load. When they're not, the global muscles like the rectus abdominis and erector spinae compensate with excessive tension - which is often what people feel as back pain.

Why crunches don't help

Sit-ups and crunches train the rectus abdominis, which is already over-recruited in most people with back pain. They also increase intradiscal pressure significantly - exactly the opposite of what you want in someone with disc-related back pain. Crunches are a movement exercise, not a stability exercise.

What actually works

The evidence points toward exercises that train co-contraction of the deep stabilisers - specifically those that require you to maintain a neutral spine while moving the limbs. Classic examples include:

• Dead bugs: maintaining lumbar position while arms and legs move
• Bird dogs: opposite arm and leg extension in quadruped
• Side planks: lateral chain stability without spinal flexion
• Pallof press: resisting rotational force

Context matters

Core training in isolation is rarely sufficient. Most people with persistent back pain also have restrictions elsewhere - tight hips, stiff thoracic spine, or hip flexors that are dominant over the glutes. A good physio assessment identifies the specific deficits rather than prescribing the same generic core program to everyone.